Lock.



G. N. MASON.

LOOK.

APPLIOATION FILED MAY 27, 1910.

970,252, Patented Sept. 13,1910. F1& 1. F1612;

mum.

UNITED STATES PATENT OFFICE.

GEORGE N. MASON, OF READING, PENNSYLVANIA, ASSIGNOR TO READING HARDWARE COMPANY, OF READING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

LOCK.

Specification of Letters Patent.

Patented Sept. 13, 1910.

Application filed May 27, 1910. Serial No. 563,785.

' To all whom it may concern:

Be it known that I, GEORGE N. MASON, citizen of the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Locks, of which the following is a specification.

This inventionrelates to improvements in looks of the class in which a number of keys for the same look are in the hands of difi'erent persons and in which the locking bolts are to be operated from both sides of the door. Locks of this class are so made that the bolts may be operated from the outside after they have been locked from the inside, but under certain conditions only; and in which the locks may be 0 erated from the inside even when locked rom the outside. In all locks of this class, a means has been provided for withdrawing one bolt while the other bolt is being protracted. Means have also been provided to stop the movement of the key, so that it could not be withdrawn, Without retracting the bolt. In the present instance I have provided a device, in the form of a yoke iece in which both functions are provided or in the same device.

The invention consists of a yoke adapted to operate both bolts and provided with an integral checking dog or stop adapted to engage the key bit, so that the turning of the key will 0 erate the bolts in opposite directions as be ore, and the stop will always engage the key bit when it is intended that it should so engage it.

In the accompanying drawing, I have shown a portion of a two bolt lock, with my invention in position thereon.

Figure 1 shows the lock with both bolts retracted; Fig. 2 shows the outside bolt protracted and Fig. 3 shows the inside bolt protracted.

The numeral 1 designates the lock casing; 2 the inside locking bolt; 3 the outside looking bolt and 4 and 5 designate tumblers for the respective bolts. All of these parts are of the ordinary construction.

The numeral 6 designates my improved yoke. This device is pivoted to the inside of the casing, at a point approximately at its center and its upper end engages one of the locking bolts while the lower end engages the other, operating in pockets 10 formed in the bolts. This yoke piece is formed with an integral projection 7 formed at one side and about the center, and it is adapted to lie in the path of the bit of the key when inserted in the key opening 8 of the casing.

lVith the look as shown in Fig. 1, when the bolt 2 is protracted, the parts assume the position shown in Fig. 3. The key cannot be removed without retracting the bolt 2,1because it contacts with the stop 7 on the yo to.

With the look as shown in Fig. 1 and the key inserted in the outside, the bolt 3 would be protracted, as shown in Fig. 2; to unlock the door from the inside, with the bolts in this position, the key would protract the bolt 2, and this would retract the bolt 3, leaving them as shown in Fig. 3, with the key bit in contact with the stop 7. The continued movement of the key is arrested by the stop 7 and to withdraw the key, it must be reversed, which will retract the bolt 2.

lVhen the door has been locked, say from the inside, it will be necessary to unlock it before the key can be removed from the look. This is because the key bit is arrested in its movement by the stop 7. This stopping of the key movement is done to prevent the removal of the key with the door locked, thus insuring against misplaeing of the key by an occupant of a room whose door has been locked.

The construction is extremely simple but it is positively unfailing in its action.

WVhat I claim is 1. In a lock the combination with a casing of a plurality of locking bolts, tumblers adapted to engage said bolts, and a yoke 6 pivotally secured to the casing and in movable engagement with said locking bolts, said yoke having an integral stop in the form of a projection 7 adapted to lie in the path of the key bit when the lock is operated from one side.

2. In a door lock, the combination with a easing of an inside looking bolt; an outside In testimony whereof I afiiX my signature, locking bolt; tumblers adapted to engage in presence of tWo Witnesses. said bolts; and a bolt operating yoke 6, pivotally secured to the casing and in engage- GEORGE N. MASON. ment with both locking bolts, said yoke having an integral stop 7 at one side, adapted Witnesses:

to lie in the path of the key bit Whenever ED. A. KELLY,

the inside locking bolt is protracted. J. OR. KELLY. 

